| Business | Phone |
| Acterna 2121 Argentia Rd, Toronto | (416) 657-4097 |
| Infonet Services Canada 120 Adelaide St W #2215, Toronto M5H 1T1 | (416) 216-7001 |
| Mci Worldcom 151 Front St W, Toronto M5J 2N1 | (416) 862-0705 |
| Pair Gain Technologies Canada 67 Mowat Ave, Toronto M6K 3E3 | (416) 516-5561 |
| Focus Voice & Data Svc Inc 2 College St #111, Toronto M5G 1K3 | (416) 415-3333 |